Showing papers in "Journal of Dairy Science in 1977"

TL;DR: The North Central Regional Research Committee on Improving Large Dairy Herd Management (NC-119) encourages researchers to consider these guidelines in designing, conducting, and reporting results of calf experiments.

TL;DR: In this paper, cows were assigned randomly to shade or no shade treatments during the summers of 1974 and 1975, and cows had free access to adjacent bermudagrass sod.

TL;DR: This paper showed that the conjugated trans, trans-trans-trans, trans, cis octadecadienoic acids of milk fat consisted essentially of cis -9, trans -11-octadecada-nodes.

TL;DR: Progress has been considerable in understanding some aspects of ruminant gluconeogenesis, but many more studies will be required to obtain a complete understanding.

TL;DR: Activity monitoring appears to have potential as an aid in estrus detection in cows during the breeding period after calving.

TL;DR: In this article, the authors investigated the extent to which the excited state molecular oxygen species, singlet oxygen 1 O 2, participates in milk lipid oxidation and found that it is the immediate source of the hydroperoxides that initiate lipid oxidation catalyzed by three agents.

TL;DR: A linear diffusion test capable of measuring milk clotting enzyme activity at concentrations of 1 ×10 −4 to 1×10 −1 rennin units per ml is described in this paper, where the distribution of rennet activity between curd and whey in freshly coagulated milk was measured at 72% in the whey and 31% in curd at pH 66 At pH 52, the wheY contained 17% and the curd 86% Total recovery of activity was 102±5% Distribution of milk clotbing enzymes from Mucor pusillus var Lindt and Muc

TL;DR: Data on oral and "gastric" lipases in calves, humans, and rats suggests that gastric lipase is oral lipase, and data on pH and temperature optima as well as activation and inhibition of oral lipases is contradictory but appears to vary considerably between species.

TL;DR: In this article, the authors used a least squares procedure to determine behavior with varying number of free stalls and length of feed bunk for 12 dairy cows and found that cows' behavior was altered when less than.67 free stalls or.2m of linear feed bunk was available per cow.

TL;DR: In this article, the best linear unbiased predictions of random variables (breeding values or sire values) not appearing in the model for records are presented. But these predictions do not cover all variables not in the models.

TL;DR: Order of greatest weight gain over 4 mo was group, individual, and isolated, and group calves ranked highest in the social hierarchy in post-weaning groups.

TL;DR: In this paper, 24 Holstein heifers were fed grain and alfalfa hay ad libitum for accelerated growth from 91kg body weight until verification of pregnancy (Treatment A). Grain then was deleted until near time of freshening.

TL;DR: The evidence reviewed shows that a majority of this nitrogen is derived from or deposited in skeletal muscle proteins, and it is concluded that the labile protein reserve is a product of the normal, dynamic metabolism of protein.

TL;DR: The authors found that hydrogen peroxide produced by L. bulgaricus during the manufacture and/or storage of yogurt appeared to be the main substance responsible for the antagonism of L. acidophilus toward Lactobacillus.

TL;DR: Two experiments with lactating Holsteins monitored time required for alterations in adrenal glucocorticoid output in response to injection of 200 IU of adrenocortiotropin after exposure to increased density and social disruption, showing that adrenal response, as measured by glucoc Corticoids, occurs within 2 days.

TL;DR: In this paper, the prediction models were developed for milk yield (squared multiple correlation.807) and dry matter intake (741) by stepwise backward elimination procedures, 192 separate regression models were studied to identify important independent and dependent variables in prediction models.

TL;DR: Carbon-14 uniformly labeled L-valine, leucine, and isoleucine were extracted by the lactating bovine mammary gland in excess of outputs in milk protein to represent a potential source of energy to the mammary glands as well as a source of carbon and alpha-amino nitrogen for synthesis of nonessential amino acids.

TL;DR: Both α s1 and κ-caseins were incubated at 37C in the presence of bovine plasmin (28mg/ml) prepared from fresh blood plasma as mentioned in this paper.

TL;DR: In this paper, the authors analyzed composite samples of milk collected during the first 15 wk of lactation from 21 Holstein cows fed a milled ration containing 0 (basal), 15% (medium), or 30% (high) protected-tallow supplement (seven cows per treatment).

TL;DR: Relative variability of means of herd and bull progenies indicated removal due either to mastitis or disease as mostly involuntary compared with general health or production which was mostly voluntary; therefore, culling rates at younger ages will be more useful for bull evaluation than culling rate at older ages or length of herdlife.

TL;DR: Rumen microbial extracts possessed glutamate synthase activity which in conjunction with glutamine and asparagine synthetases may provide an efficient means of glutamate synthesis at low rumen ammonia concentrations.

TL;DR: Partial enzymatic hydrolysis of whey protein by trypsin increased solubility of this protein in water and improved digestibility, while Predenaturation of the substrate by heat did not improve digestibility.

TL;DR: Colostral immunity appears to depend upon sensitizing events within the intestine and respiratory tract, followed by the migration of lymphoid precursors to the breast, suggesting a relationship between the expression of immunity at various secretory surfaces.

TL;DR: This concept is attractive because mammary cells neither are synchronized highly for biosynthesis nor secrete normal milk for several days after calving, and concentrations in plasma are low for progesterone and estrogen, similar to 3 days before calving for glucocoiticoids and prolactin, and increasing for insulin.

TL;DR: The use of formic acid to desiccate standing forage in an effort to control dry matter has been shown to improve the quality and animal responses with wilted silages as discussed by the authors.

TL;DR: The importance of keeping cows on feed immediately pre- and postpartum must continue to be stressed because aged cows had lower plasma concentration of calcium, higher free fatty acids in plasma, and higher magnesium in plasma than young cows.

TL;DR: The results show that milk fat globule membrane is nearly homogenous in content of intrinsic membrane proteins and certain membrane-bound enzyme activities but is markedly heterogeneous with respect to buoyant density and lipid content.

TL;DR: P. roqueforti and the neutral protease play a fundamental role in the proteolysis induced by their microorganisms during cheese ripening, and induce large increases in pH 4.6-soluble nitrogen and nonprotein nitrogen and a high increase of free amino-acids.

TL;DR: Calves receiving 83mg oxytetracycline daily consumed more starter, gained more weight, and tended to have firmer feces than did those in the control group, and the cultured milk did not affect weight gains or frequency of diarrhea significantly.